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gerrit-public.fairphone.software / kernel / msm-4.19 / 4749c09c37030ccdc44aecebe0f71b02a377fc14 / . / include / net / gre.h
blob: b53182018743f4383e525c43f30fc25bd5b4f5a8 [file] [log] [blame]
Dmitry Kozlov00959ad2010-08-21 23:05:39 -0700[diff] [blame]1#ifndef __LINUX_GRE_H
2#define __LINUX_GRE_H
3
4#include <linux/skbuff.h>
Pravin B Shelarc5441932013-03-25 14:49:35 +0000[diff] [blame]5#include <net/ip_tunnels.h>
Dmitry Kozlov00959ad2010-08-21 23:05:39 -0700[diff] [blame]6
7#define GREPROTO_CISCO 0
8#define GREPROTO_PPTP 1
9#define GREPROTO_MAX 2
Pravin B Shelarbda7bb42013-06-17 17:49:38 -0700[diff] [blame]10#define GRE_IP_PROTO_MAX 2
Dmitry Kozlov00959ad2010-08-21 23:05:39 -0700[diff] [blame]11
12struct gre_protocol {
13 int (*handler)(struct sk_buff *skb);
14 void (*err_handler)(struct sk_buff *skb, u32 info);
15};
16
Pravin B Shelarc5441932013-03-25 14:49:35 +0000[diff] [blame]17struct gre_base_hdr {
18 __be16 flags;
19 __be16 protocol;
20};
21#define GRE_HEADER_SECTION 4
22
Dmitry Kozlov00959ad2010-08-21 23:05:39 -0700[diff] [blame]23int gre_add_protocol(const struct gre_protocol *proto, u8 version);
24int gre_del_protocol(const struct gre_protocol *proto, u8 version);
25
Pravin B Shelarbda7bb42013-06-17 17:49:38 -0700[diff] [blame]26struct gre_cisco_protocol {
27 int (*handler)(struct sk_buff *skb, const struct tnl_ptk_info *tpi);
28 int (*err_handler)(struct sk_buff *skb, u32 info,
29 const struct tnl_ptk_info *tpi);
30 u8 priority;
31};
32
33int gre_cisco_register(struct gre_cisco_protocol *proto);
34int gre_cisco_unregister(struct gre_cisco_protocol *proto);
Daniel Borkmannc50cd352013-07-01 19:24:00 +0200[diff] [blame]35
Pravin B Shelar752f36d2013-06-17 17:49:45 -0700[diff] [blame]36void gre_build_header(struct sk_buff *skb, const struct tnl_ptk_info *tpi,
37 int hdr_len);
Eric Dumazet2d26f0a2013-10-19 11:42:55 -0700[diff] [blame]38
39static inline struct sk_buff *gre_handle_offloads(struct sk_buff *skb,
Tom Herbert4749c092014-06-04 17:20:23 -0700[diff] [blame^]40 bool csum)
Eric Dumazet2d26f0a2013-10-19 11:42:55 -0700[diff] [blame]41{
Tom Herbert4749c092014-06-04 17:20:23 -0700[diff] [blame^]42 return iptunnel_handle_offloads(skb, csum,
43 csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE);
Eric Dumazet2d26f0a2013-10-19 11:42:55 -0700[diff] [blame]44}
45
Pravin B Shelarbda7bb42013-06-17 17:49:38 -0700[diff] [blame]46
47static inline int ip_gre_calc_hlen(__be16 o_flags)
48{
49 int addend = 4;
50
51 if (o_flags&TUNNEL_CSUM)
52 addend += 4;
53 if (o_flags&TUNNEL_KEY)
54 addend += 4;
55 if (o_flags&TUNNEL_SEQ)
56 addend += 4;
57 return addend;
58}
59
Pravin B Shelarc5441932013-03-25 14:49:35 +0000[diff] [blame]60static inline __be16 gre_flags_to_tnl_flags(__be16 flags)
61{
62 __be16 tflags = 0;
63
64 if (flags & GRE_CSUM)
65 tflags |= TUNNEL_CSUM;
66 if (flags & GRE_ROUTING)
67 tflags |= TUNNEL_ROUTING;
68 if (flags & GRE_KEY)
69 tflags |= TUNNEL_KEY;
70 if (flags & GRE_SEQ)
71 tflags |= TUNNEL_SEQ;
72 if (flags & GRE_STRICT)
73 tflags |= TUNNEL_STRICT;
74 if (flags & GRE_REC)
75 tflags |= TUNNEL_REC;
76 if (flags & GRE_VERSION)
77 tflags |= TUNNEL_VERSION;
78
79 return tflags;
80}
81
82static inline __be16 tnl_flags_to_gre_flags(__be16 tflags)
83{
84 __be16 flags = 0;
85
86 if (tflags & TUNNEL_CSUM)
87 flags |= GRE_CSUM;
88 if (tflags & TUNNEL_ROUTING)
89 flags |= GRE_ROUTING;
90 if (tflags & TUNNEL_KEY)
91 flags |= GRE_KEY;
92 if (tflags & TUNNEL_SEQ)
93 flags |= GRE_SEQ;
94 if (tflags & TUNNEL_STRICT)
95 flags |= GRE_STRICT;
96 if (tflags & TUNNEL_REC)
97 flags |= GRE_REC;
98 if (tflags & TUNNEL_VERSION)
99 flags |= GRE_VERSION;
100
101 return flags;
102}
103
Dmitry Kozlov00959ad2010-08-21 23:05:39 -0700[diff] [blame]104#endif